Called the Hoya plant – climbing, clambering, creeping, or wax-stemmed plant with a thick wax leaf makes an excellent house plant.
Known as the “Hindu rope plant” or “wax plant”, Hoya has been enjoyed for decades, perhaps because fanciers enjoy their easy going as a houseplant indoor dispositions.
Page Contents & Navigation
- 1 History Of The Hoya Plant
- 2 Hoya Flowers Exquisite Creations
- 3 Hoya Leaves & Foliage – Striking & Variable
- 4 How To Care For The Hoya Plant… It Does Not Require Pampering
- 5 The How To’s Of Hoya Plant Propagation
- 6 Hoya Pest and Problems
- 7 Hoya Species
History Of The Hoya Plant
The name “Hoya” honors Thomas Hoy, gardener to the Duke of Northumberland and the first to bring this superb house plant into prominence.
Native to southern India, highly prized, and the subject of legend. You’ll find Hoyas throughout eastern Asia to Australia and classified botanically in the asclepias (milkweed) family.
The exact number of species is a mystery. Bailey’s Standard Cyclopedia of Horticulture estimates there are 100 species. The most common species, and the one most often seen and grown as a houseplant is Hoya carnosa and Hoya carnosa variegata.
Thick leaves of green, rimmed with red and white, and a waxen texture from which it derives the nick-name “wax plant.”
Hoya Flowers Exquisite Creations
In a sunny window the foliage is unusually decorative, and their late spring and summer flowers are highly prized.
Some consider Hoya blooms among the most exquisite creations of nature, seemingly fashioned from ivory or porcelain, with glimmering centers of ruby and amethyst. The blossom of Hoya carnosa carries a delicate, elusive fragrance which is barely noticeable.
The waxen ball of five-pointed, double stars, is geometrically perfect; giving the bloom an artificial look. Those experiencing Hoya carnosa for the first time are pleasantly surprised to find it is real.
TIP: Do not touch or move the Hoya plant during its blooming period.
Hoya Leaves & Foliage – Striking & Variable
The striking foliage of Hoya carnosa variegate with it’s succulent foliage is quite variable, and sometimes changes as the plant matures.
The compact form – Hoya carnosa compact, a curious variation with crumpled foliage, puts out one of the most spectacular blooms of the species.
How To Care For The Hoya Plant… It Does Not Require Pampering
Native to tropic and subtropical regions, most hoyas do equally well in homes, in protected areas or a greenhouse. The hoyas that vine and climb do so by means of small stem rootlets, when untrained, they form a thick mat. Several species make beautiful baskets and look great on a small trellis.
Lighting – a north window is a good location. Although the plants do not require direct light, they would not do well away from a window, unless you prefer to grow them under fluorescent grow lights. Supply all but the hottest sun.
Soil – a moist, well-drained, light soil – African Violet soil with some added perlite – is a good growing medium.
Watering – keep the soil moist in spring and summer, dry but not to the point of shriveled foliage in winter. In dry climates more frequent watering may be necessary.
Some like to mist the leaves frequently, to clean them and increase humidity… but NOT when the plant is budding or in flower.
Temperature – give them medium (50 degrees) to warm temperatures during the growing season—spring and summer. The plants go semi-dormant in winter.
Fertilizer – In spring hoyas react favorably to feeding. A fertilize with liquid balanced food, about every four weeks, three or four times during the growing season will produce a vigorous growth. Withhold food during the winter. More on liquid food here.
Blooms appear in spring and summer when the plant is most active. Lack of water or too much fertilizer will cause foliage to brown around the edges and perhaps leaves will drop.
As with most plants, Hoyas respond to good care. However, they resent pampering, hovering, and constant handling and moving.
One Hoya peculiarity worth noting: They produce blooms on knobby spurs which stay on the plant even after blossoms fade. New buds will be generated there to provide bloom the next time. The lesson to learn: to encourage prolific blooming, leave the flower spurs on the plant.
Also, for fuller flowering, most growers recommend tho keep the roots pot-bound.
What To Do When Your Hoya Is Not Blooming?
Question: I have an 8 year old Hoya vine, growing long vines but never flowers. What can I do to make it produce flowers? HB, Minnesota
Answer: Many home hoya growers cannot get their plant to bloom. Plants flourish best in bright light, in humid air, with ample moisture at the roots. But, hoyas need a break.
During winter keep the plants cool, 50 degrees, and rather dry. Continued high temperature, fertilizer (liquid), and moisture promotes leaf and stem growth and prevents the formation of flower buds.
After buds set, you can increase the temperature again slightly.
Hoya Bloom Time Lapse
The How To’s Of Hoya Plant Propagation
Propagate Hoya plants from cuttings of top growth, or by leaf cuttings in the same manner as African violets and gloxinias. The average cutting or leaf start will produce a blooming plant in two years or less.
The easiest method of propagation is by layering. Layers mature faster and do not need as much patience. Pin down a stem, at the joint, in a moist rooting medium. Sever and pot the new plant after roots form.
I have taken a mature Hoya variegata; severed and planted every leaf and stem; and in less than a year have produced 78 healthy plants! For an excellent starting medium try a commercial African violet soil and I prefer small clay tree cotta pots over plastic, although either can use either.
Tips For Rooting Hoya in Water
The most fetching hanging vase I’ve ever seen was a brown jug filled with rooted wax plant cuttings, all growing in water.
The glass of the jug was barely transparent. They used three kinds of wax plants:
- Hoya carnosa (plain green leaves)
- The variegated form of carnosa
- Hoya bella (miniature)
I made a similar planting, and gave the vines food by following the directions on a tub of soluble houseplant fertilizer. However, the vines will thrive unbelievably long without any food in the water.
Seeds Are Scarce
Starting seeds is almost unheard of because the blooms seldom produce seeds. It seems that pollination is a difficult business which in nature is carried out by an insect foreign to the United States.
Hoya Pest and Problems
Hoya has remarkably few pests. The worst is the root-knot nematode. Because of it the hoya is rarely grown out-of-doors in Florida and other frost-free sections where climate would permit. If there is a nematode within 100 miles, it seems to seek the hoya and destroy it.
If you do find a hoya dying from a nematode infection, you can salvage leaf and stem cuttings to start new plants. Discard and destroy the roots and soil of an infected plant.
Hoya australis – has huge, waxen, deep-green leaves measuring nearly four inches across, and splotched with silver. It is a vigorous, strong grower, vining kind with distinctly fragrant flowers, pink with red crowns.
Hoya bandaensis – Sturdy plant with deep-green glossy leaves.
Hoya bella – is a handsome dwarf, small growing species with slender upright branches that droop down as they age; a non climber, small leaves are thick, dark green; flowers are white with purple centers. An old favorite.
Hoya carnosa – Old-timer with shiny dark-green oval-pointed leaves, spreading sprays of faint pink flowers centered with a red star-crown. This one climbs best by sinking its aerial roots into a porous support like a moss pole.
Several variations are available: ‘Exotica,’ with green leaves centered with cream, sometimes pink-tinged; variegata, the leaves irregularly edged with creamy-white, touched with pink in sun.
Hoya coronaria – is a climber, not widely available, with waxy leaves that re-curve and are hairy beneath. It has pale lemon yellow flowers with red spots.
Hoya imperialis – Stems and leaves dusted with down, margins curled; large red-brown flowers with creamy centers.
Hoya keysi – has thick close-jointed stems and heavy, gray-green leaves covered with down, off-white flowers, red base.
Hoya latifolia (cinnamonum) – Egg-shaped coppery leaves with paler veins.
Hoya longifolia shepherdi (angustifolia) – Slender leaves indented at the center vein so they’re almost folded; delicate display of white flowers accented with bright wine.
Hoya macrophylla – Creeping species with light-veined, copper-green leaves, white flowers.
Hoya motoskei – Free-flowering vine (considered the true Hoya carnosa) has elliptical leaves of lighter green unevenly speckled with silver; with clusters of pinkish-white flowers with maroon centers.
Hoya multiflora – a stout, climbing plant, with large leathery leaves and pale yellow flowers; ‘Silver Leaf’ is a variety of multiflora with dark green leaves blotched with silvery pink.; red stems; hairy flowers the color of vintage wine, with a crown of silver-pink stars.
Common Name: Wax Plant